'''
Created on 2019年5月22日

@author: Administrator

python 运算符
注意  //取整
** 乘方  幂次方
'''
from cmath import pi
from _overlapped import NULL
a = 10
b = 3
print(a/b)
print(type(a))
'''
python 比较符号

'''
c = 12
d = "你好"
#类型不同的数据不能比较
#print(c>d)

'''
python成员运算符

in  not in 
'''
a = 10
list2 = [10,12,13]

if(a in list2):
    print("a 在集合里面")
    
'''
python 身份运算符
is is not
is来判断两个标识符是不是引用自一个对象

'''
a = 1
b = 20
print(a==b)
print(a is b)
c = a and 2
print(c)



f = "hello"
f = NULL
print("null is " +str(f))

print(pi)
print(2**7)






